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COMSOL example model results do not match with Mathematical Model 
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#1
Jun1211, 12:43 AM

P: 29

Hi! I started to look into freq response analysis of a cantilever beam using COMSOL. Luckily COMSOL already has an example model "Model Library>> Structural mechanics module>>Dynamics and Vibrations>>rotating blade". While not changing anything in the model and with Omega=0 and Cloris =0, I get the following results
Resonance Freq1 = 84.36 Resonance Freq2 =528.84 Resonance Freq3 =949.31 Resonance Freq4 =1316.00 Resonance Freq5 =1481.41 Resonance Freq6 =2882.00 But Euler beam theory (options>>constants) gives me the following Resonance Freq1 = 84.36 Resonance Freq2 =528.66 Resonance Freq3 =1862.89 Resonance Freq4 =3650.55 Resonance Freq5 =6034.61 Resonance Freq6 =9064.89 Clearly the results do not match after 2nd natural/ resonance freq. I am quite sure that COMSOL example model cannot be wrong but there is something odd. Some elaboration would be appreciated 


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